Clinical Application Of Residual Molar Crown Restoration By Multi-fiber Posts Joint With Zirconia Ceramic Crown

Objective:To explore the clinical effect of multi-fiber posts on molar residualcrowns and provide a theoretical basis for the clinical application of fiberposts．Methods:Choosing45cases with58decayed teeth from September.2012toMarch.2014in prosthodontics department of the China-Japan UnionHospital of JiLin University.The comprehensive treatment plan was madeand root canal treatment or periodontical treatment was completed beforerestoration.The multi-fiber posts were bonded with composite resin andthe core was built by high strength resin,then the Zirconia ceramic crownwas prepared to complete the therapy.All the patients were followed by6to12months,then record and observe the clinical effects from thefollowing aspects according to the evaluation criteria of California DentalAssociation: crown and post loss,root fracture,post break,the state ofgingival,apical periodontitis.Results:Three patients failed to follow the revisit,thus the four teeth were excluded from the study.Data were obtained from the remaining45patients with58teeth followed by6to12months.Results showed96.30%of the cases were successful,during the observation period.Twocases failed,one case was collapse of porcelain crown due to biting hardobjects seven months later,the other case appeared prosthesis crown off10months later.Conclusion:It’s proved that the restoration for morlar crown with extensive defect bymultiposts combined with Zirconia full ceramic crown coluld get thesatisfied clinical results;The application of fiber posts was in favor ofavoiding root fracture for its elastic modulus similar to dentin;theexistence of dentin shoulder collar is an important factor in the success ofmulti-fiber posts restoration,therefore we should carefully chosen therestoration when tooth structure misses too large,for the reason of fewerpossibilities of getting enough teeth dentin shoulder collar.